last_x 289 core/gps_math.c rcb->last_x = 0.0; last_x 332 core/gps_math.c rcb->last_x = x; last_x 366 core/gps_math.c return rcb->last_x * rcb->s + rcb->t; last_x 67 core/gps_math.h double last_x;